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Yes, its Open source. The tools we use (Perl, PostsgreSQL, Apache ++) is also Open source.
Open source means that the source code of the software is available for free to everyone and you can modify the code and distribute it yourself. http://en.wikipedia.org/wiki/Open_source [1]
Look for a place to contribute [2]. This means not only programming, but also documentation, theme design, art work, or architectural design. Join the mailing list [3].
GNU GENERAL PUBLIC LICENSE Version 2
http://ledger-smb.svn.sourceforge.net/viewvc/ledger-smb/trunk/LICENSE [4]
Links:
[1] http://en.wikipedia.org/wiki/Open_source
[2] http://ledgersmb.org/community
[3] http://ledgersmb.org/topic/support/mailing-lists-rss-and-nntp-feeds
[4] http://ledger-smb.svn.sourceforge.net/viewvc/ledger-smb/trunk/LICENSE
[5] http://ledgersmb.org/release/10
[6] http://ledgersmb.org/release/11
[7] http://ledgersmb.org/release/12
[8] http://ledgersmb.org/release/13
[9] http://ledgersmb.org/release/14
[10] http://ledgersmb.org/release/20